So lets get this going. ;) What kind of display/backlight does your F7 have? Nice and black or with a bluish tint (showing black color on the display, with backlight on)?
I'm actually thinking about waiting till its on Amazon to be able to sent it back if its blue. My F5 always had the blue light and I thought its normal, then I got my F6 and I was surprised how nice it looked in black and that this is an upgrade. But I was just "lucky" because other models from the F6 series came with different versions.
All on 5% light, Watchface: Sundance